Abstract: An underwater watercraft including a passenger compartment and an ingress/egress port in which the watercraft has buoyancy and center of gravity adjusted to maintain a generally level or other desired attitude when submerged, and an optionally angled attitude at a water surface for ingress/egress. The attitude is also adjustable via the placement of ballast and optionally including a movable ballast that adjusts the location of the center of gravity as desired. The ingress-egress port optionally includes an entry elevated from a main passenger compartment and including a riser and optionally removable or concealable handrails. The ingress-egress port has an angled orientation in a submerged mode, and an optional orientation generally parallel to the water surface or angled but above the surface in a surface mode.

Abstract: An underwater watercraft including a passenger compartment and an ingress/egress port in which the watercraft has buoyancy and center of gravity adjusted to maintain a generally level or other desired attitude when submerged, and an optionally angled attitude at a water surface for ingress/egress. The attitude is also adjustable via the placement of ballast and optionally including a movable ballast that adjusts the location of the center of gravity as desired. The ingress-egress port optionally includes an entry elevated from a main passenger compartment and including a riser and optionally removable or concealable handrails. The ingress-egress port has an angled orientation in a submerged mode, and an optional orientation generally parallel to the water surface or angled but above the surface in a surface mode.

Abstract: An underwater watercraft including a passenger compartment and an ingress/egress port in which the watercraft has buoyancy and center of gravity adjusted to maintain a generally level or other desired attitude when submerged, and an optionally angled attitude at a water surface for ingress/egress. The attitude is also adjustable via the placement of ballast and optionally including a movable ballast that adjusts the location of the center of gravity as desired. The ingress-egress port optionally includes an entry elevated from a main passenger compartment and including a riser and optionally removable or concealable handrails. The ingress-egress port has an angled orientation in a submerged mode, and an optional orientation generally parallel to the water surface or angled but above the surface in a surface mode.

Abstract: An underwater watercraft including a passenger compartment and an ingress/egress port in which the watercraft has buoyancy and center of gravity adjusted to maintain a generally level or other desired attitude when submerged, and an optionally angled attitude at a water surface for ingress/egress. The attitude is also adjustable via the placement of ballast and optionally including a movable ballast that adjusts the location of the center of gravity as desired. The ingress-egress port optionally includes an entry elevated from a main passenger compartment and including a riser and optionally removable or concealable handrails. The ingress-egress port has an angled orientation in a submerged mode, and an optional orientation generally parallel to the water surface or angled but above the surface in a surface mode.

Abstract: An underwater watercraft including a passenger compartment and an ingress/egress port in which the watercraft has buoyancy and center of gravity adjusted to maintain a generally level or other desired attitude when submerged, and an optionally angled attitude at a water surface for ingress/egress. The attitude is also adjustable via the placement of ballast and optionally including a movable ballast that adjusts the location of the center of gravity as desired. The ingress-egress port optionally includes an entry elevated from a main passenger compartment and including a riser and optionally removable or concealable handrails. The ingress-egress port has an angled orientation in a submerged mode, and an optional orientation generally parallel to the water surface or angled but above the surface in a surface mode.

Abstract: An underwater watercraft including a passenger compartment and an ingress/egress port in which the watercraft has buoyancy and center of gravity adjusted to maintain a generally level or other desired attitude when submerged, and an optionally angled attitude at a water surface for ingress/egress. The attitude is also adjustable via the placement of ballast and optionally including a movable ballast that adjusts the location of the center of gravity as desired. The ingress-egress port optionally includes an entry elevated from a main passenger compartment and including a riser and optionally removable or concealable handrails. The ingress-egress port has an angled orientation in a submerged mode, and an optional orientation generally parallel to the water surface or angled but above the surface in a surface mode.

Abstract: An underwater watercraft including a passenger compartment and an ingress egress port in which the watercraft has buoyancy and center of gravity adjusted to maintain a generally level or other desired attitude when submerged, and an angled attitude at a water surface for ingress/egress. The attitude also is adjustable via the placement of ballast and optionally including a movable ballast that adjusts the location of the center of gravity as desired. The ingress-egress port optionally includes an entry elevated from a main passenger compartment, that has an angled orientation in a submerged mode, and an optional orientation generally parallel to the water surface in a surface mode.

Abstract: An underwater watercraft including a passenger compartment and an ingress egress port in which the watercraft has buoyancy and center of gravity adjusted to maintain a generally level or other desired attitude when submerged, and an angled attitude at a water surface for ingress/egress. The attitude also is adjustable via the placement of ballast and optionally including a movable ballast that adjusts the location of the center of gravity as desired. The ingress-egress port optionally includes an entry elevated from a main passenger compartment, that has an angled orientation in a submerged mode, and an optional orientation generally parallel to the water surface in a surface mode.

Abstract: A dome assembly comprises an upper hemispherical window having a first end surface with an upper ring assembly sealingly connected to the upper hemispherical window at or near the first end surface and a lower hemispherical window having a second end surface with a lower ring assembly sealingly connected to the lower hemispherical window at or near the second end surface. The dome assembly further comprises a spider retainer assembly comprising a spider ring assembly and one or more saddle arms having a first end and a second end with each saddle arm fixedly attached to the spider ring assembly at a first end and fixedly attached to one or more of the upper ring assembly and the lower ring assembly at a second end.

Abstract: A dome assembly comprises an upper hemispherical window having a first end surface with an upper ring assembly sealingly connected to the upper hemispherical window at or near the first end surface and a lower hemispherical window having a second end surface with a lower ring assembly sealingly connected to the lower hemispherical window at or near the second end surface. The dome assembly further comprises a spider retainer assembly comprising a spider ring assembly and one or more saddle arms having a first end and a second end with each saddle arm fixedly attached to the spider ring assembly at a first end and fixedly attached to one or more of the upper ring assembly and the lower ring assembly at a second end.

Abstract: The present invention relates to a hydraulic dampening system which has particular utility with power tools. The hydraulic dampening system includes a cylinder and a piston positioned within and movable through a stroke. The piston has a retract face which forms a first chamber with a first end wall of the cylinder and a face opposed to the retract face which forms a second chamber with a second end wall of the cylinder. The hydraulic dampening system also includes at least one port and/or at least one gap for dampening movement of the piston during its stroke.

Abstract: An underwater craft having a buoyancy control system, multi-sealed passenger chamber and emergency shut-off for external operation using inherent buoyancy of the craft.