Jonathon Angell - 23 Jul 2025 Form 3 Insider Report for Deep Isolation Nuclear, Inc.

Footnote F1

Received in connection with the Issuer's merger (the "Merger") with Deep Isolation, Inc. ("Deep Isolation") in accordance with the terms of the Agreement and Plan of Merger and Reorganization dated as of July 23, 2025, by and among the Issuer (f/k/a Aspen-1 Acquisition Inc.), Deep Isolation Acquisition Corp. and Deep Isolation (the "Merger Agreement"), in exchange for 13,375 shares of Deep Isolation common stock held by the Reporting Person immediately prior to the effective time of the Merger. Pursuant to the terms of the Merger Agreement, at the effective time of the Merger, each issued and outstanding share of Deep Isolation capital stock was converted into the right to receive 25.837283 shares of the Issuer's common stock (the "Conversion Ratio"), rounded to the nearest whole share. The Merger closed on July 23, 2025.

Footnote F2

In connection with the Merger and effective as of immediately prior to the effective time of the Merger, Deep Isolation's Board of Directors approved the accelerated vesting of all outstanding and unexercised stock options previously issued under Deep Isolation's 2018 Equity Incentive Plan (the "2018 EIP"), including the stock options reported herein. Prior to such acceleration, the stock option was subject to a 4-year vesting schedule, whereby 25% of the option shares vested as of March 15, 2023 and 1/48th of the remaining shares were scheduled to vest monthly over the 36-month period thereafter, subject to the Reporting Person's continued service through each vesting date.

Footnote F3

Received in connection with the Merger in accordance with the terms of the Merger Agreement, in exchange for Outstanding Options to acquire 625 shares of Deep Isolation common stock at an exercise price of $5.20 per share held by the Reporting Person immediately prior to the effective time of the Merger. Pursuant to terms of the Merger Agreement, at the effective time of the Merger, the number of shares of Deep Isolation common stock subject to each outstanding but unexercised option to purchase Deep Isolation common stock (each such option, an "Outstanding Option," and such number of shares of Deep Isolation common stock subject to such Outstanding Option, the "option shares") was converted into an option to purchase the number of shares of the Issuer's common stock equal to the option shares multiplied by the Conversion Ratio, rounded to the nearest whole share, and the exercise price of each Outstanding Option was divided by the Conversion Ratio, rounded to the nearest whole cent.

Footnote F4

In connection with the Merger and effective as of immediately prior to the effective time of the Merger, Deep Isolation's Board of Directors approved the accelerated vesting of all outstanding and unexercised stock options previously issued under Deep Isolation's 2018 EIP, including the stock options reported herein. Prior to such acceleration, the stock option was subject to a 4-year vesting schedule, whereby 25% of the option shares vested as of June 1, 2024 and 1/48th of the remaining shares were scheduled to vest monthly over the 36-month period thereafter, subject to the Reporting Person's continued service through each vesting date.

Footnote F5

Received in connection with the Merger in accordance with the terms of the Merger Agreement in exchange for Outstanding Options to acquire 1,000 shares of Deep Isolation common stock at an exercise price of $4.61 per share held by the Reporting Person immediately prior to the effective time of the Merger. Pursuant to the terms of the Merger Agreement, at the effective time of the Merger, the number of option shares subject to each Outstanding Option was converted into an option to purchase the number of shares of the Issuer's common stock equal to the option shares multiplied by the Conversion Ratio, rounded to the nearest whole share, and the exercise price of each Outstanding Option was divided by the Conversion Ratio, rounded to the nearest whole cent. The Merger closed on the Merger Closing Date.